33) was a law in Ireland which sought to revise Dáil constituencies.
It was challenged by John O'Donovan, a Fine Gael senator and former TD.
In O'Donovan v. Attorney-General (1961), the High Court held that the Act was unconstitutional and suggested that the ratio of representation to population across constituencies should differ by no more than 5%.
The court, interpreting the "so far as it is practicable" condition of the Constitution, suggested a 5% variation as the limit without exceptional circumstances.
[2] It was formally repealed by the Electoral (Amendment) Act 1961.